Skiving-machine.



' Patented Mar. 13, 1917.

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A. M. ALEXANDER.

SKIVING MACHINE. APPLICATION FILED DEC.31- 1914.

Patented Mar. 13, 1917.

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ALEXANDER M. ALEXANDER, 0 EEvERLYJvi' ssAcHUsErTs, AssIGNoR TO UNITED SHOE MACHINERY coMPANY, 0E rArERsoN, NEW JERsEY, A CORPORATION 0E NEW JERSEY.

SKIVING-MACHIN'E.

Specification of Letters Patent.

Patented Mar. 13, 1917.

Application filed December 31, 1914. Serial No. 879,903.

To all whom it may concern:

Be it known that I, ALEXANDER M. ALEX- ANDER, a citizen of the United States, residing at Beverly, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Skiving-Machines; and I do hereby declaregthe following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to machines for skiving leather and other material and more particularly to the mechanism for guiding and feeding the work to the skiving knife. A

It is important under certain conditions, and especially when lapping two skived edges that the beveled margins shall be of the same width irrespective of the variations in thickness of the work.

The object of the present invention is to provide a presser member of an improved form which accurately gages the work as it is fed to the knife and serves to maintain a uniform width of bevel independently of variations in thickness of the same or different pieces of work. To this end a feature of the invention consists in the combination of a rotary skiving knife, a feed roll located upon one side-of the knife, a presser member located upon the opposite side of the knife and cooperating with the feed roll, and means for automatically adjusting the presser member to vary the angle of cut made by the knife in accordance with variations in the thickness of the work.

Still further features of the invention consist in certain novel features of construction, combinations and arrangements of parts hereinafter described and claimed, the advantages of which will be obvious to those skilled in the art from the following description. I

In the accompanying drawings illustrating the preferred form of the invention; Figure 1 represents a front elevation of the improved form' of presser member before the work is inserted in the machine; Fig. 2 is a view similar to Fig. lillustrating the position of the presser member after it has been elevated by the work; Fig. 3 is a side elevation of the presser member shown in Fig. 1; Fig. 4 is a side elevation partly in section of the presser member before the work is inserted in the machine; Fig. 5 is a view similar to Fig. 4 illustrating the presser member elevated by the work; and Fig. 6 is a view partially diagrammatic, illustrating the manner in which the skiving knife operates to form a beveled margin upon the work.

. The present invention serves to automatically vary the angle of skiving made by the knife in accordance with variations in the thickness vof the work, the angle of the bevel increasing proportionately with the thickness of the work to maintain a uniform width of bevel. In the illustrated embodiment of the invention this is conveniently accomplished by provldlng a gage member which cooperates with the feed roll to determine the cut made'by the skiving knife, and a presser foot which bears upon the work in advance of the gage to automatically adjust the position of the gage in accordance with the elevation of the presser foot. In the illustrated embodiment of the invention the presser member is supported in a head indicated at 1 and cooperates with the usual feed r0112 to positi'onthe work in operative relation to a skiving knife 4:. A gage member 5 is pivoted at 6 upon a supporting plate 7 and is provided with the usual curved gaging surface to contact with the work. The angular position of the gage member is'controlled by a presser foot 8 which is adjustably supported upon an arm 10 connected at one end to a depending toe 11 through a bolt 12 received in a slot 13 formed in the toe. The presser foot 8 is provided with an inturn'ed portion 14 which, as shown clearly in Figs. 4 and 5, is arranged to engage with the work in advance of the gage-member and be elevated thereby. The position ofthe presser foot automatically conforms to the thickness of the work by an oscillation of the arm 10 about a fulcrum formed by the holding bolt 12. In order to cause the position of the presser foot to automatically govern the inclination of the gage member connections are accordingly provided between the presser foot and gage member. To this end the arm 10 is connected with a cam member 15 fulcrumed at 16 and having a curved face 18 which engages with the upper face of a flange 19 formed upon the gage member 5. The cam 15 is provided with a-Stud 20 which is received in a slot 21 formed in the arm 10, as shown clearly in Figs. 1 and 2. As the stud 20 is off-set from the fulcrum of the cam member 15, an oscillatory movement of the arm 10 in a vertical direction causes an oscillatory movement of the cam member 15 substantially at right angles. As shown clearly in Figs. 1 and 2, when the presser foot is elevated by the introduction of a piece of work into the machine the cam member 15 is rocked from substantially the position shown in Fig. 1 into the position shown in Fig. 2 and owing to the shape of the face 18 and the cooperating flange 19 this movement of the cam member permits a greater tilting movement of the gage member 5. The gage member 5 is rocked by the pressure of the work about the fulcrum 6 until the face of the flange 19 contacts with the cam member 15 to limit further upward movement, thus the cam member 15 serves to determine the angular position of the gage member 5, and as the cam member is connected directly to the presser foot the angular position of the gage member is determined by the elevation of the presser foot. The oscillatory movements of the gage 1nember 5 about the fulcrum 6 are limited by a pin 22 secured in the plate 7 and engaging with opposite ends of an arcuate recess 23 formed in the gage member on the opposite side of the fulcrum 6, as shown clearly in Fig. 2. The gage memher is normally returned to the position shown in Fig. 1 by a tension. spring 24L connecting the gage member with a fixed por tion of the head 1 and this movement is communicated to the arm 10 through a pin 26 projecting from the rear face of the arm and engaging with a curved rib 27 having its opposite ends secured to the gage member, as shown clearly in Figs. 1 and 2. The downward movement of the presser foot is limited by a stop plate 29 secured to the under side of the toe l1 and engaging with the face of the arm 10 in the lowest position. The presser foot is caused to follow the variations in thickness of the work by a spring 30 which is connected to the head 1 and bears upon the upper side of the arm 10 to maintain a yielding engagement between the presser foot and the work.

It is desirable that mechanism be pro-- vided for enabling the width of bevel formed by the knife to be conveniently adjusted and to this end mechanism is provided for adjusting the position of the cam member 15 in order that the angular position may be changed for the same vertical position of the presser foot. To this end the cam member .15 is fulcrumed upon a block 32 which is slidingly supported in a curved slot 33 formed in the plate 7. The position of the block 32 is adjusted by a rod 3d journaled in the plate 7 and having its end threadedly connected with the block. The adjusting rod is retained against lengthwise movement relative to the plate 7 and upon rotating a knurled handle 35 the block may be adjusted to shift the fulcrum of the cammember 15. The movements of the cam member 15 laterally are communicated to the arm 10 and presser'foot through a pin 37. projecting from the block 32 through an elongated slot 38 formed in the arm 10. This connection causes a transverse movement of the block to be imparted to the arm 10, sliding the bolt 12 in the slot 13, but permits an independent oscillation of the arm 10 about the bolt 12 in accordance with the thickness of the work. any adjusted position by a knurled clamping member 40 threadedly engaging with a stud 41 projecting from the rear face of the plate 7. I r

The operation of the improved presser foot may be briefly described as follows: As the work is fed to the skiving knife across the stationary table it engages first between the feed roll and the presser foot 8 elevating the presser foot to a position dependent upon the thickness of the work. This movement of the presser foot serves to rock the cam member 15 into approximately the position shown in Fig. 2 of the drawings. As the work continues its movement it contacts with the gage member 5 and tends to rock the gage member upwardly about the fulcrum 6 until the upward movement is limited by the cam 15 contacting with the flange 19. It will be obvious that the lateral position of the cam 15 depends upon the elevation of the presser foot and as this elevation is increased a greater lateral movement is imparted to the cam member, and in consequence the gage 5 is permitted to assume a greater inclination. Owing to the shape of the face 18 of the cam the upward movement of the gage is positively stopped when the flange 19 engages with the cam and is retained in this position until pormittodto drop by the work or to be further elevated by a lateral movement of the cam. The inclination of the gage determines the width and angle of the bevel made by the knife and this may be conveniently adjusted by shifting the fulcrum of the cam in order that at a predetermined elevation of the presser foot the cam shall be supported in different lateral positions. It will be seen that this construction provides a yielding presser foot the position of which is determined by the thickness of the work and a gage which is positively locked in an inclined position to determine the angle of cut made by the knife, the'inclination of the gage being governed by the position of the gresser foot.

While it is preferred to employ. thespecific construction and arrangement of parts shown and described, it will be understood that this construction and arrangement is The slide block 82is locked in not essential except so far as specified in the claims, and may be changed or modified without departing from the broader features of the invention.

The invention having been described, what is claimed is:

1. A skiving machine, having in combination, a rotary skiving knife, a feed roll located upon one side of the knife, a presser member located upon the opposite side of the knife and cooperating with the feed roll, and means for automatically adjusting the presser member to vary the angle of cut made by the knife in accordance with variations in the thickness of the work.

2. A skiving machine, having in combination, a rotary skiving knife, a feed roll lo cated upon one side of the knife, a gage member located upon the opposite side of the knife and cooperating with the feed roll, and means for automatically varying the angular position of the gage member in accordance with Variations in the thickness of the work.

3. A skiving machine, having in combination, a rotary skiving knife, a feed roll located upon one side of the knife, a presser foot located upon. the opposite side of the knife and cooperating with the feed roll, a gage member arranged to be moved angularly by the work, and mechanism controlled by the presser foot for determining the angular position of the gage member.

4. A skiving machine comprising a gage member arranged to bear upon the work, a presser foot arranged to bear upon the work in advance of the gage member, and operative connections between the presser foot and gage member for varying the position into which the gage member may be moved by the work in accordance with variations in the vertical position of the presser foot.

5. A skiving machine comprising a supporting head, gage member pivoted to the head, a cam member for determining the anular position of the gage member, a presser foot, and connections between the presser foot and cam member for determining the position of the cam member.

6. A skiving machine comprising a gage member for determining the angle of bevel formed by the skiving knife, a pivoted cam member, a presser foot, and connections be tween the presser foot and cam member for oscillating the cam member upon a substantially vertical movement of the presser foot.

7. A skiving machine comprising a gage member, a presser foot, connections between the presser foot and gage member for determining the angular position of the gage member in accordance with variations in the termining the position of the gage member,

and connections between the presser foot and cam.

9. A skiving machine comprising a supporting plate, a gage member pivoted upon the plate, a cam member fulcrumed upon the plate, and mechanism for adjusting the fulcrum of the cam member transversely of the plate to vary the angular position of the gage member determined by the cam.

10. A skiving machine comprising a gage member, a presser foot having a slot formed therein, a pivoted cam member, and a pin secured to the cam member and received in the slotted portion of the presser foot to cause an oscillation of the cam member upon a vertical movement of the presser foot.

11. A skiving machine comprising a sup porting plate, a gage member pivoted to the supporting plate and having a curved gaging surface, a cam member having a curved surface normally contacting with the gage member, and means for adjusting the angular position of the cam member to vary the angular position of the gage member deter mined thereby.

12. A skiving machine comprising a gage member, a presser foot cooperating therewith, means for normally maintaining the presser foot in adjusted position, means for limiting the downward movement of the presser foot, and connections between the presser foot and gage member.

13. A skiving machine comprising a supporting plate, a gage member fulcrumed upon the plate, a block adjustable transversely of the plate, a cam member fulcrumed upon the block and operatively engaging at its opposite end with the gage member, and means for varying the angular position of the cam member.

14:. A skiving machine comprising a supporting plate, a gage member, a cam member, a presser foot, mechanism for adjusting the cam member transversely of the supporting plate, and connections between the cam, member and the presser foot for causing a like transverse movement of the presser foot.

ALEXANDER M. ALEXANDER.

Witnesses:

CHESTER E. Romans, E. MARION BLACK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

